Usually snapping off lugs is caused by the monkeys at the tire shop massively overtightening them. In the case of Model S lugs, hammering on them with an impact gun will also destroy them. It causes them to distort. If you can't get the proper size socket on them, that is what happened to them.
Last fall I swapped wheels for another local Model S owner who couldn't get an appointment before the first snowstorm. The shop that had installed his wheels for the summer (who will remain unnamed Frisby), had obviously pounded his lugs on with an impact. I had to use the next-size-up socket because they were distorted, and some of the nuts needed well over 200 ft-lbs to break them loose. I advised him to get new lug nuts. Fortunately his winter wheels had their own lug nuts so it wasn't a big hurry.
Even a reputable shop can do this to you, despite best intentions. When you hire minimum wage staff you don't always get enthusiastic workers. Best to go to Tesla or do it yourself, IMHO. Or stand there and watch them to make sure they use a torque wrench.
